Transactions verification update

[novacoin.git] / src / kernel.cpp

diff --git a/src/kernel.cpp b/src/kernel.cpp
index 959bd10..bd1cdf3 100644 (file)
--- a/src/kernel.cpp
+++ b/src/kernel.cpp
@@ -23,6 +23,9 @@ static std::map<int, unsigned int> mapStakeModifierCheckpoints =
         ( 37092, 0xd230afccu )
         ( 44200, 0x05370164u )
         ( 65000, 0xc8e7be6au )
+        ( 68600, 0x73a8cc4cu )
+        ( 92161, 0xe21a911au )
+        ( 98661, 0xd20c44d4u )
     ;
 
 // Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
@@ -31,6 +34,18 @@ static std::map<int, unsigned int> mapStakeModifierCheckpointsTestNet =
         ( 0, 0x0e00670bu )
     ;
 
+// Get time weight
+int64 GetWeight(int64 nIntervalBeginning, int64 nIntervalEnd)
+{
+    // Kernel hash weight starts from 0 at the 30-day min age
+    // this change increases active coins participating the hash and helps
+    // to secure the network when proof-of-stake difficulty is low
+    //
+    // Maximum TimeWeight is 90 days.
+
+    return min(nIntervalEnd - nIntervalBeginning - nStakeMinAge, (int64)nStakeMaxAge);
+}
+
 // Get the last stake modifier and its generation time from a given block
 static bool GetLastStakeModifier(const CBlockIndex* pindex, uint64& nStakeModifier, int64& nModifierTime)
 {
@@ -275,17 +290,9 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned
     bnTargetPerCoinDay.SetCompact(nBits);
     int64 nValueIn = txPrev.vout[prevout.n].nValue;
 
-    int64 nTimeWeight;
     uint256 hashBlockFrom = blockFrom.GetHash();
 
-    // Kernel hash weight starts from 0 at the 30-day min age
-    // this change increases active coins participating the hash and helps
-    // to secure the network when proof-of-stake difficulty is low
-    //
-    // Maximum TimeWeight is 90 days.
-    nTimeWeight = min((int64)nTimeTx - txPrev.nTime - nStakeMinAge, (int64)nStakeMaxAge);
-
-    CBigNum bnCoinDayWeight = CBigNum(nValueIn) * nTimeWeight / COIN / (24 * 60 * 60);
+    CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64)txPrev.nTime, (int64)nTimeTx) / COIN / (24 * 60 * 60);
     targetProofOfStake = (bnCoinDayWeight * bnTargetPerCoinDay).getuint256();
 
     // Calculate hash
@@ -347,10 +354,6 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash
     if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
         return tx.DoS(1, error("CheckProofOfStake() : INFO: read txPrev failed"));  // previous transaction not in main chain, may occur during initial download
 
-#ifndef USE_LEVELDB
-    txdb.Close();
-#endif
-
     // Verify signature
     if (!VerifySignature(txPrev, tx, 0, true, 0))
         return tx.DoS(100, error("CheckProofOfStake() : VerifySignature failed on coinstake %s", tx.GetHash().ToString().c_str()));
@@ -366,13 +369,6 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash
     return true;
 }
 
-// Check whether the coinstake timestamp meets protocol
-bool CheckCoinStakeTimestamp(int64 nTimeBlock, int64 nTimeTx)
-{
-    // v0.3 protocol
-    return (nTimeBlock == nTimeTx);
-}
-
 // Get stake modifier checksum
 unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex)
 {